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Cannabis use is not independently associated with causing violence, according to the results of a multivariate analysis to be published in the journal Addictive Behaviors... Investigators concluded: "When analyses were conducted controlling for covariates, the frequency of alcohol and cocaine use was significantly related to violence, suggesting that pharmacological effects [of the drugs] may play a role in violence. Frequency of cannabis use, however, was not significantly related to violence when controlling for other factors."

The study’s conclusions are similar to the findings of a pair of recent government reports refuting allegations that cannabis use triggers violent behavior. The first, published by the Canadian Senate in 2002, determined: "Cannabis use does not induce users to commit other forms of crime. Cannabis use does not increase aggressiveness or anti-social behavior." The second review, published by the British Advisory Council on the Misuse of Drugs, reported: "Cannabis differs from alcohol in one major respect. It does not seem to increase risk-taking behavior. This means that cannabis rarely contributes to violence either to others or to oneself, whereas alcohol use is a major factor in deliberate self-harm, domestic accidents and violence."